The Startling Effect of Diet on the Brain

The Startling Effects of Diet on the Brain

More and more research is highlighting the strong connection between the gut and the brain. For many years we’ve heard of the damage that can be done to our bodies by high fat and high sugar diets. Now, there is startling evidence that the effects on our bodies are only part of the story, with diet also able to cause changes in the brain.

New research has found that a diet high in fat and sugar causes changes in the gut bacteria that seem to be related to a significant loss of cognitive flexibility, which is the power to adapt to change. The effect was strongest on a high sugar diet, which also impaired long and short-term memory.

The research was conducted on mice (because of their biological and physiological similarities to humans). After being fed different diets, they were given a variety of tests to explore the changes in their mental and physical function, as well as the changes in different types of gut bacteria.

After four weeks on a high fat or high sugar diet, there was a significant decline in the mental and physical function of the mice. One of the most profound changes was in cognitive flexibility.

Magnussen explained cognitive flexibility in this way, ‘Think about driving home on a route that’s very familiar to you, something you’re used to doing. Then one day that road is closed and you suddenly have to find a new way home.’

[irp posts=”590″ name=”Anxiety, Depression and the Surprising Role of Gut Bacteria”]

Someone with a high level of cognitive flexibility would quickly adapt by finding another way home, and remembering to use that same route the next morning. Someone with diminished cognitive flexibility would struggle to adapt to the change, and would likely have a slow, stressful trip home.

The mice used in the study were younger ones, who would typically have a greater capacity to resist the impact of changes to their gut bacteria, or microbiota. In older humans or animals whose biological system might not be as healthy, the effect of high sugar and high fat on cognitive function might be even stronger.

‘It’s increasingly clear that our gut bacteria, or mictrobiota, can communicate with the human brain,’ reported Kathy Magnussen, a professor at Oregon State University.

 This study backs up an abundance of previous research that has demonstrated the influence of food on the brain, and gives us another good reason to taper down on fat and sugar.

5 Comments

Carol

This is such poignant information for my family. Thank you so much! I’ve learned a lot through your posts on your site “Hey Sigmund”. This is practical and applicable advice !

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Noelle

Very interesting … I’ve had an interest in holistic mental/physical health for some time. The theory of the gut as tied to other parts of a person’s health has really grabbed me.

However, I wonder about one part of this article: you mention that studies see high sugar and high fat as similarly destructive of overall health. I agree about sugar (that is, processed sugars). However, from what I’ve read, the common wariness about high fat comes from a faulty lumping-together of ALL kinds of fats into one category, rather than distinguishing different kinds. That is, there is a huge difference in the consumption of processed fats (typical of modern American diets) and the traditional consumption of unprocessed plant and animal fats. Take the French, for example, who seem to have a generous approach to natural fats and yet don’t suffer negative consequences from it. I’d love to see this research taking more of these sorts of distinctions into account, and see how it affects the outcomes.

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Over the past the past 24 hours, I’ve been in Devonport, Tasmania to deliver two sessions to parents and carers - ‘Big Feelings, Connection, and Confidence’, then later an open Q and A where parents brought their real life questions - and we talked.

Thank you for welcoming me so warmly, and for trusting me with your questions, your stories, and your vulnerability. 

This was an openness where real change begins. Parenting is hard - beautiful and messy and hard. In the last 24 hours, I’ve been moved by the openness and honesty of parents I’ve shared space with. This is where generational patterns start to shift.

So many of the parents I met are already doing this deep, brave work. The questions asked were honest, raw, and profoundly human — the kind of questions that can feel heavy and isolating until you hear someone else ask them too.

Our children will grow in the most incredible ways if we allow them the space, and if we hold that space with love and leadership and a curious mind. And, if we open ourselves to them, and are willing to shift and stretch and grow, they will grow us too.

Thank you to @devonportevents for everything you’ve done to make these events happen.♥️
Can’t wait for this! I’ll be in Devonport, Tasmania next week to present two talks for parents and carers. 

The first is on Monday evening 19 May for a talk about how to support big feelings, behaviour and regulation in young people. This is not just another anxiety talk. You’ll walk away feeling hopeful, empowered, and with strategies you can start using straight away. 

Then, on Tuesday morning 20 May, I’ll be giving another talk for parents and carers but this will be a Q&A. Bring your questions to me! Even if you don’t have questions, the ones I answer will be loaded with practical information that will support you in your parenting journey. 

So grateful to @devonportevents for organising the events. They are public talks, open to everyone. 

Tickets available at Humanitix - search Devonport events and scroll down until you find me! 

Would love to see you there.♥️
Hello Adelaide! I’ll be in Adelaide on Friday 27 June to present a full-day workshop on anxiety. 

This is not just another anxiety workshop, and is for anyone who lives or works with young people - therapists, educators, parents, OTs - anyone. 

Tickets are still available. Search Hey Sigmund workshops for a full list of events, dates, and to buy tickets or see here https://www.heysigmund.com/public-events/
First we decide, ‘Is this discomfort from something unsafe or is it from something growthful?’

Then ask, ‘Is this a time to lift them out of the brave space, or support them through it?’

To help, look at how they’ll feel when they (eventually) get through it. If they could do this bravely thing easily tomorrow, would they feel proud? Happy? Excited? Grateful they did it? 

‘Brave’ isn’t about outcome. It’s about handling the discomfort of the brave space and the anxiety that comes with that. They don’t have to handle it all at once. The move through the brave space can be a shuffle rather than a leap. 

The more we normalise the anxiety they feel, and the more we help them feel safer with it (see ‘Hey Warrior’ or ‘Ups and Downs’ for a hand with this), the more we strengthen their capacity to move through the brave space with confidence. This will take time, experience, and probably lots of anxiety along the way. It’s just how growth is. 

We don’t need to get rid of their anxiety. The key is to help them recognise that they can feel anxious and do brave. They won’t believe this until they experience it. Anxiety shrinks the feeling of brave, not the capacity for it. 

What’s important is supporting them through the brave space lovingly, gently (though sometimes it won’t feel so gentle) and ‘with’, little step by little step. It doesn’t matter how small the steps are, as long as they’re forward.♥️
Of course we’ll never ever stop loving them. But when we send them away (time out),
ignore them, get annoyed at them - it feels to them like we might.

It’s why more traditional responses to tricky behaviour don’t work the way we think they did. The goal of behaviour becomes more about avoiding any chance of disconnection. It drive lies and secrecy more than learning or their willingness to be open to us.

Of course, no parent is available and calm and connected all the time - and we don’t need to be. 

It’s about what we do most, how we handle their tricky behaviour and their big feelings, and how we repair when we (perhaps understandably) lose our cool. (We’re human and ‘cool’ can be an elusive little beast at times for all of us.)

This isn’t about having no boundaries. It isn’t about being permissive. It’s about holding boundaries lovingly and with warmth.

The fix:

- Embrace them, (‘you’re such a great kid’). Reject their behaviour (‘that behaviour isn’t okay’). 

- If there’s a need for consequences, let this be about them putting things right, rather than about the loss of your or affection.

- If they tell the truth, even if it’s about something that takes your breath away, reward the truth. Let them see you’re always safe to come to, no matter what.

We tell them we’ll love them through anything, and that they can come to us for anything, but we have to show them. And that behaviour that threatens to steal your cool, counts as ‘anything’.

- Be guided by your values. The big ones in our family are honesty, kindness, courage, respect. This means rewarding honesty, acknowledging the courage that takes, and being kind and respectful when they get things wrong. Mean is mean. It’s not constructive. It’s not discipline. It’s not helpful. If we would feel it as mean if it was done to us, it counts as mean when we do it to them.

Hold your boundary, add the warmth. And breathe.

Big behaviour and bad decisions don’t come from bad kids. They come from kids who don’t have the skills or resources in the moment to do otherwise.

Our job as their adults is to help them build those skills and resources but this takes time. And you. They can’t do this without you.❤️

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